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Mamba 100

Mamba 100 is back in 2024! Registration is open and filling up fast!

Mamba 100 in 2023 was a huge success as we are so excited to have it again in 2024. If you are looking to PR your 100 miler or run a sub-24 hour, then this race is perfect for you. It's also a race for a first time 100 miler, or any distance. All race distances will end at 5:00 pm on Saturday Nov. 9th. That's 34 hours to finish the 100 miler, 22 hours to finish the 100k, 10 hours to finish the 50k, and 8 hours to finish the 25k. You must finish by 5:00 pm on Nov. 9th to earn your buckle or medal. With very little elevation gain this race will be fast and fun. The race will be mostly on single track trails with half the loop running right along the Wolf River. The course will be a looped course at 14.30 miles long. 7 loops for the 100 miler. 4 loops for the 100k (with a shorter loop at the start), 2 loops for the 50k, and 1 loop for the 25k.

$2000 Cash and Raffle Prizes

This year, we're upping the prize ante to a total of $2,000. ALL registrants are eligible to win! 5 registered runners will be drawn at random to win cash in the amount of $1,000, $500, $300, $100, and $100. We will announce the winners of the cash drawings and raffle prizes at the pre-race dinner. What other races are out there where you could win $1,000 simply for registering for the race?

Not only do you have a chance to win lots of cash but you also have the chance to win raffle prizes. This past year we gave out over 30 raffle prizes from cash - t shirts - hats - hoodies - $150 Breakaway Running Store gift card - Mamba 100 puffer jacket - water bottle - singlets - books and more.

You can only win 1 prize. Once your name is drawn, it will not be added back to the drawings. The cash drawings will be first so every runner has the chance to win the big money!

We are also adding a pre-race pasta dinner at the FedEx Event Center at Shelby Farms. We invite you to carb load with good company while enjoying the beautiful park! 

Dates and Times

Thursday, Nov. 7th - Pre-race Pasta Dinner
Friday, Nov. 8th 7am - 100 mile start time

Friday, Nov. 8th 7pm - 100k start time
Saturday, Nov. 9th 7am - 50k start time 9 am - 25k start time

All races end at 5 pm on Saturday Nov. 9th

Age Limit Requirements

100 miler - 18 years old and up
100k - 18 years old and up
50k - 17 years old and up (Parent or Guardian must sign Waiver)
25k - 16 years old and up (Parent or Guardian must sign Waiver)

There are no exceptions to the age requirements listed above.

Race Distances

100 miler: Whether you're a veteran 100 mile runner or this is your very first 100, the Mamba 100 miler is the race for you. You'll have lots of support from the volunteers and your friends/family to help you finish the 100 miles. The course is set up for you to finish. Its an easy trail run course as the loop is broken down into many small sections that change up the scenery. One mile you'll be on trail covered by trees, and the next mile you'll be in an open field surrounded by deer. Included with your registration is a very nice hooded puffer jacket with the Mamba 100 logo on it (colors may vary), and you can bet the buckle will have a snake on it. You'll be able to bring your own canopy tent area to set up at the start line for your personal aid station and for your crew to hang out. Your crew will have a lot of fun crewing as the start/finish line will be busy with great music and a fun atmosphere. If you're deciding what distance then why not go for the 100 miler? We will do everything we can to get you across the finish line.

100k: A night time start of 7 pm. How cool is that? These runners will get to start and run fresh into the night and finish in the sunrise hours of the morning. Not only that but you'll join the 100 milers who'll be 12 hours into their race so you will have an immediate impact on those runners by boosting them up for their night run too. Headlights are a must for the night as the trail gets dark. There will be lots of volunteers set up all along the course so you'll never feel like your alone for miles and miles at night. Your family and friends will have quite a few opportunities to see you along the way as the course is set up for ease of access for friends. So come run this unique distance and start at night. We'll be sure to have a big cheering crowd for you to start your run at 7 pm

50k: This race starts at 7 am on Saturday Nov. 9th and you'll be cheering on and seeing the 100 milers that finish around the 24 hour time limit. You'll be the cheerleader for the tired 100 milers then you'll get to go run your race. This race will be 2 loops with a very small 2.5 mile loop at the start. This race will go quicker than you think as the loop is pretty fast. You can walk a lot of it and still finish in time.

25k: And the last race starts at 9 am on Saturday Nov. 9th. You'll run 1 loop + 1.2 mile at the start for this race. You can walk most of this race and still finish in time. This is the perfect race for anyone looking for a fast time or your first time 25k.

Transfer of Distance

You can upgrade to a longer distance by paying the difference in pricing. This is only available if spots are open in that race. Dropping down in a distance will not be refunded the difference.

Refund Policy / Roll Over Credit

No cash refunds and no bib transfers.
Entry can be deferred for 50% race credit if done at least 60 days prior to the race. Entry can be deferred for 25% race credit if done at least 30 days prior to the race. No race credit after October 8th, 2024.


We have one of the best coming to be the official photographer of the race. Jenny El Tee is bringing her photography talent to get the best shots of all runners and their race experience. Her work has been featured 2 times on the front cover of Ultra Running Magazine (March 2023 and November 2021) and being published 12 times with photos and 3 articles in the magazine. So your photo from the Mamba races just might make it in Ultra Running magazine!

Accommodations, etc.

The Wolf River Trailhead (start / finish line) is right off of Germantown Parkway and you'll have everything you need all within a mile or two. There are four hotels a mile away and this entire area is in a great part of Memphis.

Holiday Inn Express & Suites 7784 Wolf Trail Cove Germantown, TN 38138 (901) 309-6700
Courtyard Memphis/Germantown 7750 Wolf River Blvd. Germantown, TN 38138 (901) 751-0230
Homewood Suites 7855 Wolf River Blvd. Germantown, TN 38138 (901) 751-2500
Hampton Inn & Suites 1680 S. Germantown Rd. Germantown, TN 38138 (901) 309-0555

Walmart and Kroger are 2 miles away. Kroger is the Memphis area grocery store

Restaurants - There are many restaurants packed up and down Germantown Parkway

Breakaway Running Store - less than a mile away for all your running needs and gear

Things to do: Visit Shelby Farms Park. The trails that the Mamba race are ran on are part of Shelby Farms Park. The park is huge covering 4,500 acres and is one of the largest urban parks in the country. There are over 40 miles of trails both paved and unpaved and over 20 lakes. The park is also home to a herd of buffalo that you can see while walking the trails. is the website so check out all there is to do here.

Parking for the race: Parking will be on the Agricenter grounds next to the corn maze. This will be about a 3/4 mile walk to the start line. There are limited parking spots at the start line but those will be reserved for volunteers. You will be able to drive to the start line and drop off your things but must park in the parking area for runners. A shuttle to and from the parking lot and start/finish line will be provided again this year. The parking lot area will have security the entire time of the race. There is a gate to the parking lot by the start/finish line that will be closed at sunset Friday night and won't open until sunrise Saturday morning. The parking area where runners and crew park does not have a gate. You'll be able to leave at any part of the day or night if needed.

The trails are open to the public during the day so not only will you see runners but you'll see people walking the trails or riding their bike. There will be signage months before the race telling people about the race that weekend.

Bathrooms: There will be port-a-pottys at the start/finish line and at Aid Station #2.

For more information join these pages:
Facebook Group: Mamba Trail Runners (this page is packed with information from group challenges to a runner's bio.)
Instagram: Mamba Trail Runners
Youtube: Mamba Trail Runners

Pacers, Crew and Gear

All 100 miler and 100k runners are allowed a pacer. The 100 mile runners can pick up a pacer after mile 50 when you get back to home base aid station. The 100k runners can pick up a pacer after mile 35 when you get back to home base aid station.

All runners are allowed a crew for support. No support from crew outside of designated aid station crew areas. The 100 miler and 100k runners are allowed to set up a canopy tent at the start/finish aid station area. Here your crew can hang out and you can have all your necessary belongings you need for the race. There will be no drop bags outside of the start/finish line area. The trail is open to the public during the daytime hours so don't be leaving any valuable personal things at your area without it being supervised. The volunteers aren't responsible to watch over personal belongings.

Trekking poles are allowed for the race for any distance runner. If you need trekking poles for some of the race then bring them and leave them in your bag at the start/finish area and you can grab them when you think you need them. Some of the trails are tight in areas and having poles when you don't need them just takes up that much more room.

Shoes: You can run the entire race on road shoes or trail shoes and no gaiters are needed. There are no rocks on the trail, just a few roots sprinkled along the way.

Aid Stations and Night Course Marshal

There will be 2 manned aid stations fully-stocked with water, electrolyte drinks, gels, snacks, food, first aid, and enthusiastic volunteers! Hot food will be provided for the 100 miler and 100k runners at night. This is also a cupless race so you must carry your own hydration vessel (bottle, pack, collapsible cup).

There will be several Night-time Course Marshals walking along the trails to assist any runners during the 100 miler or 100k. The course marshal duty is to manage the safety of the runners at night as this is my #1 commitment. The course marshal will not provide hydration or food to runners.
The start/finish line will have an aid station, then you'll run 3.8 miles to the next aid station. After this aid station you'll run 7.5 miles then come back to this same aid station. Then run 3 miles back to the start/finish line aid station.

Cobra Den Trail Series

June 15 - Cape 5k / 10k  -  Tour de Wolf trails (TDW pavilion start line.
June 29 - Samar 4 / 8 Miler - Wolf River Trails off Germantown Parkway.
July 13 - Caspian 5 / 10 Miler - Tour de Wolf Trails (TDW pavilion start line.
August 3rd - King 10k / Half-Marathon - Wolf River Trails off Germantown Parkway.

The Cobra Den Trail Series is a 4-race series on the Tour De Wolf trails and the Wolf River Trails at Shelby Farms in Memphis, TN.   Cape 5k and 10k held on June 15, 2024, on the Tour de Wolf trails will kick off our trail series.  The second race of the series will be the Samar 4 and 8 milers on June 29, 2024, at the Wolf River Trails, followed by the Caspian 5 and 10 milers on July 13th, 2024, on the Tour de Wolf Trails and last race is the King 10k and Half Marathon held on August 3rd, 2024, on the Wolf River Trails. 

You can sign up for the Long Series/Short series, or individual races.  Search in the search box on the race you'd like to run and register for it there.  If you want to run the Cobra Den Trail Series (4 races) then search for Cobra Den Trail Series.  


The Tour De Wolf trails are single track soft dirt trails and open fields of grass while the Wolf River Trails are all dirt trail, wooded, and flatter.   Both trails are very easy to run from the amateur runner to the professional runner and fast times are likely for all races.  We will use an open road at the beginning of each race to prior to running the single-track trail.   

Age restrictions: Distances 10k and below are open to ages 5 and above with parent/guardian waiver signature, and race distances of 8 miles and up are open to ages 13 and up with parent/guardian waiver signature.  

We will have water/aid stations along the course (number of aid stations and food available will be dependent on race distance) with race hydration, water, coke, candy, gels, ice, snack foods, etc.   Cooling towels will be provided at the beginning of each race.  The start/finish of the race will be a fun, music filled atmosphere.  We will rock out to some of your favorite tunes to get you hyped up for your race.  The race will be chip timed with results posted on RunSignup.  

Each participant in the Cobra Den trail series will receive a short sleeve T-shirt and this shirt will be the same shirt for all 4 races dates.   If you run multiple dates, then you'll only receive 1 shirt.  We will offer a total cash raffle prize of $125 before the start of each race date, so this means 4 opportunities for you to win cash if you run all 4 race dates, with a total of $500 cash given out in the Cobra Den Trail Series.  

In the event of severe weather, we will delay the start as necessary to avoid lightening. If severe weather threatens the entire day and does not appear to let up, we may be forced to cancel.   If it is rain only, then the race will go on as is.  

There are no refunds, deferrals, credits or friend / family transfers on entries. We do not mail shirts or medals to participants unable to make the event.  

There will be very loose cutoffs. It is our goal to get more people in this awesome sport of trail running no matter what skill you are.  However, we would suggest that if you are not able to maintain 17-minute miles that you please consider doing the Short Series vs the Long Series. There will be a 20 minute/ mile cutoff for Long Series participants.

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